CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Aug. 31, 2011	Aug. 31, 2010
Current Assets:
Receivables, allowance for doubtful accounts	$ 5,000	$ 15,000
LIABILITIES AND EQUITY
Other accrued expenses, fair value of derivative instruments	$ 884,000	$ 767,000
Equity:
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	45,000,000	45,000,000
Common stock, issued (in shares)	30,695,933	30,624,666
Common stock, outstanding (in shares)	29,900,030	29,897,909
Treasury stock, shares (in shares)	795,903	726,757